Respironics BiPAP Service Manual page 64

Chapter 5
Diagnostic Mode and Troubleshooting
Event ID
437 CBIT VBATT MONITOR FAIL
438 CBIT BATTERY THERMISTOR
FAILURE
439 BOARD OVER TEMPERATURE
440 BLOWER SWITCH CONTROL
FAILURE
441 IPC CBIT TEST FAILURE
442 BOARD UNDER
TEMPERATURE
5-32
Table 5-3: Significant Event Codes (Continued)
Comment / Corrective Action
User interface processor detected that the VBATT test failed during CBIT.
1. If running on battery, ensure that the battery is fully charged.
2. Check if the problem occurs during AC and battery operation.
3. Enter Diagnostics mode and use the Sensor Readings screen to check the
voltage and ADC readings.
4. Replace the user interface PCB.
User interface processor detected that the battery thermistor test failed during
CBIT.
1. Ensure that the system is at room temperature or within operating
specifications.
2. Verify that the battery is present.
3. Check the battery wiring for shorts or opens.
4. Enter Diagnostics mode and use the Sensor Readings screen to check
temperature and ADC readings.
5. Replace battery.
6. Replace the user interface PCB.
User interface processor detected that the PCB high temperature test failed
during CBIT.
1. Ensure that the system is at room temperature or within operating
specifications.
2. Enter Diagnostics mode and use the Sensor Readings screen to check
temperature and ADC readings.
3. Replace the user interface PCB.
User interface processor detected that the blower test failed during CBIT.
1. Enter Diagnostics mode and use the System Test screen to check if the blower
can be turned on.
2. Check the blower switch control cable.
3. Replace the user interface PCB.
4. Replace the controller PCB.
5. Replace the blower.
User interface processor detected that the IPC test failed during CBIT.
1. Enter Diagnostics mode and use the System Test screen to check if the blower
can be turned on and off. Also check that the backup alarm can be turned on
and off.
2. Check the interprocessor communications cable.
3. Replace the user interface PCB.
User interface processor detected that the PCB low temperature test failed
during CBIT.
1. Ensure that the system is at room temperature or within operating
specifications.
2. Enter Diagnostics mode and use the Sensor Readings screen to check
temperature and ADC readings.
3. Replace the user interface PCB.
BiPAP Focus Ventilator Service Manual © Respironics, Inc. REF 1029568 Rev B